CNC Factory Price Guide: What Actually Drives the Number

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  What moves a CNC factory price the most
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  How each factor scales a CNC factory price
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  Where the money in a CNC factory price guide actually goes
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  How to check a quote against a CNC factory price guide
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  When a higher CNC factory price is still the cheaper one
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  Five changes that lower a CNC factory price without losing function
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  Step by step: getting a comparable quote from each factory

Most quotes break into five blocks: material, programming, setup, machine time, and post-processing. Machine time is usually 40 to 60 percent of the total on production parts and over 70 percent on one-offs. If a shop cannot tell you its hourly rate, you cannot sanity-check anything else on the document.

Programming is a fixed cost. A simple turned part might take 30 minutes to program. A 5-axis housing with 40 features can take 6 hours or more. That cost does not disappear at volume, but it gets divided by the batch. This is why a 100-piece order is often 40 percent cheaper per part than a 10-piece order of the same geometry.

Setup covers fixturing, tool loading, and first-article checks. Shops that run 16 simultaneous 5-axis centers can often reach more faces in one setup, which cuts both fixture cost and the error stack that comes from re-clamping. Fewer setups is usually the single largest lever on a complex part.

Post-processing is the line buyers miss. Anodizing, electroless nickel, bead blasting, and laser marking are usually outsourced and priced per batch or per rack. A $200 minimum charge on a 50-piece run adds $4 per part. Ask whether finishing is quoted per piece or per lot before you compare totals.

Start with the material line. Confirm the alloy, temper, and stock form, not just 'aluminum'. A 7075-T6 plate costs two to four times a 6061 plate of the same weight, and 17-4PH bar stock runs well above 303 stainless. If the line says only 'steel', the shop has not quoted your part yet.

Next, look at whether setup is a single line or repeated per operation. A part that needs three operations should show three setups, or one setup on a machine that reaches all three faces. If the count looks wrong in either direction, ask for the operation list.

Then check the tolerance callout. If your drawing has a general block tolerance of ±0.1 mm, a shop quoting to ±0.005 mm everywhere is either padding the number or will call you about it later. Match the quoted tolerance to the critical dimensions on your drawing.

Finally, check what is excluded. Deburring, cleaning, inspection reports, and packaging sometimes appear as separate lines or as a note. A lower subtotal with four exclusions is not a lower price. Ask for an all-in number on the same scope from every shop.

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  Ask for the operation listIt shows machine, setup count, and estimated cycle time per face.
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  Ask for the hourly rate3-axis, 4-axis, and 5-axis rates differ. So does mill-turn.
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  Ask what is excludedFinishing, inspection reports, and freight are the usual gaps.
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  Ask for lot chargesOutside processes often have per-lot minimums that scale oddly.

Price per part is a poor metric on its own. The number that matters is landed cost: part price plus inspection burden plus the cost of a late or wrong delivery. A shop that ships in 3–5 days with a historical late-delivery probability below 2 percent is often cheaper overall than a shop that saves 15 percent per part but slips two weeks.

Certification matters when your part needs traceability. ISO 9001:2015 covers general process control. IATF 16949:2016 adds automotive traceability and change control. ISO 13485:2016 is the medical device standard. ISO 27001:2022 covers information security, which matters if you are sending CAD files for unreleased products.

Machine range is the other check. A shop with a 4,000 mm maximum processing size and a Ø400 mm rotary table can handle large frames and cylindrical work that a small mill cannot reach. If your part exceeds the shop's travel, the quote will come back as a subcontracted line with margin added on top.

Ask how inspection is handled. A shop that inspects 100 percent before shipment and can supply raw material checks, in-process monitoring, and final reports is doing work you would otherwise pay an inspection house to repeat. That is real cost, not marketing.

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  Landed cost, not unit priceAdd inspection, freight, and delay risk to every number.
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  Match certification to your marketAutomotive, medical, and ITAR-adjacent work need different paperwork.
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  Check machine travel firstOversize parts often get subcontracted with added margin.
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  Confirm the DFM stepA shop that flags thin walls and deep pockets before cutting saves rework.

Relax tolerances you do not need. Engineers often copy a tight callout from a legacy drawing. If a ±0.05 mm tolerance works, quoting ±0.005 mm can double cycle time for a dimension nobody measures. Go through the drawing and mark which tolerances are functional.

Pick a free-machining alloy where the service allows it. 303 stainless machines roughly 30 to 40 percent faster than 316 and holds finish better. 6061-T6 is easier on tools than 7075. If corrosion or strength rules these out, the savings are not available, but it is worth a check before quoting.

Reduce the number of setups by design. A part that can be reached from five faces in one 5-axis setup avoids three re-clamps. Re-clamping adds fixture cost, handling time, and stack-up error. Sometimes a small geometry change lets the shop reach a feature without turning the part.

Use standard stock sizes. A part sized to 25 mm bar stock avoids a custom extrusion or a large plate cut down to size. Material is often 20 to 40 percent of the part cost, so a stock-size change can move the total more than a rate negotiation.

Batch your prototype with production. If the design is close to frozen, ordering 50 pieces instead of 5 spreads setup and programming across more parts. The per-part number drops sharply, and you have spares for testing.